I have been finding that when I generate a sawtooth wave in the 
treble register (somewhere around an octave or more over 
middle c) that I am getting some strong undertones as well.  
I am using a sample rate of 44100.  I have tried it using 
Gen7 and also Gen10.  

Is this happening because some of the upper
partials are running into  the Nyquist boundary?  Does 
anyone know a practical way of handling this?  Would be 
very grateful for help.